<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        button {
            width: 50px;
            height: 50px;
            margin: 10px;
            border-radius: 20%;
            border: none;
            background-color: rgb(20, 208, 105);
        }
    </style>
</head>

<body>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <div id="app">
        <div><button>nh</button></div>
    </div>
    <script>
        const { createApp } = Vue
        createApp({
            data() {
                return {
                    message: 'Hello Vue!'
                }
            }
        }).mount('#app')
    </script>
</body>

</html>